Manual Definition of points for image correction

asked 2016-10-03 13:56:07 -0500

Hi all!

I have a question concerning the camera Calibration (eliminating effects due to camera abberations):

I took the following picture

image description

and ran the script for correction. However, at the edges of the corrected picture, there is still some curvature remaining. This I can see from the holes on the silver board below the checkerboard page.

Since the silver board below has holes in defined distance (delta x, delta y)=25mm, I was wondering whether and how I could use the holes, which cover almost the whole image region, for calibration.

Thanks in advance for tips and ideas Peter

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Comments

You cannot use a pattern in the center of your image and expect the borders to be properly deformed. Basically you need to move the calibration pattern in all positions in the images received from the camera, especially in the corners and at the borders, because deformation is larger there, in order to achieve a better correction at borders.

StevenPuttemans gravatar imageStevenPuttemans ( 2016-10-04 04:43:33 -0500 )edit
2

Yep. If your camera is mounted in place (which yours appears to be), just move the chessboard. You should take a good two-three dozen images with the chessboard in different positions. It should be flat, so you might need to tape it to something rigid, if that's paper.

Tetragramm gravatar imageTetragramm ( 2016-10-04 17:33:31 -0500 )edit